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Fuel Pump relay?

Tiny
GATOGEAR13
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 120,000 MILES
Several Issues I will start from beginning. Steering Column had issues because the shifter was hard to take out of Drive. Truck died and would not start, replaced the fuel pump but still not receiving power. Noticed that the instrument panel gauges are stuck all forward and the truck will shift manually without any effort as if the brake was depressed. Per advice of a backyard mechanic got a used computer from a wrecking yard and made sure that all the numbers matched up no change. Put back original computer.

I have a suspicion that it it has something to do with the steering column but I am not sure.

Other symptoms have a P040 and P041 Code may be unrelated but have replaced mufflers and 02 sensors.
Rear Brake light turns off when the brakes are hit replaced bulb.

These may not be related but this is all I can think of.

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Tuesday, November 5th, 2013 AT 9:35 AM

34 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Computers are vin specific meaning they have to be programmed to your vehicle. Check ground on back of frame drivers side for brake lights. It's probably corroded and not making contact so lights go out. If the column was replaced check wires to make sure they are all the correct ones as different years change on these. The diode on your truck key may not match the ignition switch so it won't start. If you have the anti theft light see pic for instructions on how to reset. The codes are incorrect and need another number to get what they are. You'll have to get it scanned because it may be the fuel control module as well. Here is the fuel pump relay location below. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, November 5th, 2013 AT 12:15 PM
Tiny
GATOGEAR13
  • MEMBER
  • 5 POSTS
Original column. Just worked the other day. Original cpu. On fuel pump relay switch replaced and still will not click. Diode 87 with an electrical tester turns on when grounded. DIODE 87 does not light up when turning over key. Any suggestions?
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Tuesday, November 5th, 2013 AT 1:11 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The instruction s I sent in pic should cure the anti theft problem I 'm sure that is what is stopping your fuel. Did you try that at all? If not that then it's going to have to be scanned to see what has happened to security system pulling the computer and replacing it then replacing it again did not help things actually. You mayhave to do the sequence like it says in pic if not it may need a scanner to fix it.
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Tuesday, November 5th, 2013 AT 1:18 PM
Tiny
GATOGEAR13
  • MEMBER
  • 5 POSTS
It has a passlock system that does not seem to be on tried it and nothing. Hooked up OBDII meter and it does not recognize that ignition is on what you think. I know this OBDII works on this truck that is how I got the original codes
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Tuesday, November 5th, 2013 AT 2:40 PM
Tiny
GATOGEAR13
  • MEMBER
  • 5 POSTS
I also jumped 87 and 30 on fuel pump relay switch and fuel pump does work continuously
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Tuesday, November 5th, 2013 AT 2:41 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I don't know what to tell you then. Best thing is to let a local pro look at it. It kind of sounds like the pcm isn't sending the signal to engage the relay so the engine will run. Check the dark grn/white wire and see if it is getting power in fuse box if it is then the spade on relay may have to be bent for better contact or it's bad the one in fuse box or the connection is bad at pcm.
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Tuesday, November 5th, 2013 AT 3:09 PM
Tiny
GATOGEAR13
  • MEMBER
  • 5 POSTS
You don't think that the blinker not working, The fuel pump not activating, the instrument cluster not working and the ObdII reader saying iigniton is of has anything to do with ignition switch? I am not sure but I thought id bring it up
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Tuesday, November 5th, 2013 AT 3:32 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The dash could be just bad as they are digital but it's worth a try ignition switches do go bad. Have you check checked ign fuse E in under hood fuse box? That powers up the fuel pump module which also powers fuel sender gauge. The dash power comes from tans fuse and gauge fuse in ip fuse panel. Which is fuse 4 & 20 in the ip fuse box. Have you checked all ignition and ecm fuses in the under hood fuse box with a test light or voltmeter?
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Tuesday, November 5th, 2013 AT 3:48 PM
Tiny
AJBRENHAM
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET SILVERADO
  • 106,000 MILES
I have done quite a bit of work to troubleshoot the problem to no avail.

I have electricity at relay at hood location. I swapped relay with other same type of relay and did not have any good luck. New fuel pump installed (I still have bed of truck off. Replaced fuel pump initially; old filter was not blocked. I am not getting electric at fuel pump connector.

There is electric at fuel gauge connector at new fuel pump. Is there a fuse in addition to the relay? If so, how is it labeled? If this is not the problem, what do you suggest?

Thanks.
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-1
Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
You mean you did not test for power at relay? Simple 12v test light would do that.
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If you got power on the relay and you jump it and the FP powers up-best check the computer controlled of the FP relay
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
WOLFRANCH
  • MEMBER
  • 5 POSTS
  • 1998 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 93,000 MILES
I have no power in the gray wire to my fuel pump. The pump and wires are new, fuel filter, pump relay, pcm, all fuses have been checked. Still nothing. Any help?
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Do you have power at the switched circuit of the fuel pump relay when the key is turned on?
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
WOLFRANCH
  • MEMBER
  • 5 POSTS
With the relay out I only show power at the wire from the pcm
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Which wire has 12 volts?


https://www.2carpros.com/forum/automotive_pictures/102900_fuel_pump_1.jpg

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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Make sure ECM B fuse is good.
Make sure you have a good ground for relay terminal 86.
Make sure the wire to relay terminal 85 shows 12 volts when key is turned on.
Make sure you have constant 12 volts at relay terminal 87.
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
CHRISTINANEAL23
  • MEMBER
  • 2 POSTS
  • 1998 CHEVROLET SILVERADO
  • 200,000 MILES
I replaced the fuel pump, relays, filter, and fuses, but the fuel pump is not kicking in unless I hook it directly to the battery terminal. The fuel pump is getting power, but still not priming.
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
WOLFRANCH
  • MEMBER
  • 5 POSTS
The DR GRN/WHT wire is the only one with 12 volts. Thanks for the other tips. I will check them in the morning and get back to you.
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you replace the connector? It is a comon issue for no pump.
Check the ground side as well.

Roy
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Friday, June 26th, 2020 AT 12:50 PM (Merged)
Tiny
WOLFRANCH
  • MEMBER
  • 5 POSTS
I checked the terminals. All is correct voltage. ECM-B fuse is good with 12 volts present. The relay was the first thing replaced. Then the pump and filter. The PCM was last.
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Friday, June 26th, 2020 AT 12:50 PM (Merged)

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